The United States Air Force History and Museums Program consists of more than 200 Air Force historians. They write the annual wing, numbered air force and major command histories that document all Air Force activities. Air Force historians maintain the Air Force legacy. During combat operations, they provide information and analysis for current operations as well as records and interpretation for when the operation ends. While obviously useful in recording wartime data, they also record peacetime operations, such as humanitarian relief missions, bringing food and medical supplies to disaster areas, or training events that lead to better mission capabilities.